<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script>
var num=1;
//number
console.log(typeof num);
var boo=true;
//boolean
console.log(typeof boo);
var str='hello word';
//string
console.log(typeof str);
var und=undefined;
//undefined
console.log(typeof und);
var nu=null;
//object
console.log(typeof nu);
</script>
</head>
<body>
</body>
</html>